My secy was reviewing first class tickets from Los Angeles to Atlanta on August 3, 2011. There's a Delta #200 Departs 10:20am - 757 - Business Class $666.70 or Delta # 1754 Departs 11:50am - 767 - First Class $616.70. Which flight would be best to select? Is there a difference in meals or service? My meeting is on Thursday, August 4. Thank you in advance.